By zieckey ()
本文在 Nokia 6120C 手机上测试成功.该手机是S60第三版操作系统.
1、新建J2ME项目工程：
New->Project->J2ME->J2ME Midlet Suite->Next
输入工程名字：FirstJ2ME
点击Finish.
输入以下代码:
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/*
* @(#)AlertsMIDlet.java
*/
package zieckey.j2me.study;
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.TextBox;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
/**
* 该程序用来学习Alert控件的用法。 不同的Alert类型会发出不同的声音。
*
* @author Zieckey
* @version 07/01/19
*/
public class AlertsMIDlet extends MIDlet implements CommandListener
{
private Display display;
private TextBox textbox;
private Command exitCommand;
private Command alarmCommand;
private Command confirmCommand;
private Command errorCommand;
private Command infoCommand;
private Command warningCommand;
private Alert alarmAlert;
private Alert confirmAlert;
private Alert errorAlert;
private Alert infoAlert;
private Alert warningAlert;
/**
* 构造函数
*/
public AlertsMIDlet( )
{
display = Display.getDisplay( this );// 提取系统设备的Display对象
exitCommand = new Command( "Exit", Command.EXIT, 2 );
alarmCommand = new Command( "Alarm", Command.SCREEN, 2 );// 对该菜单的相应应用到当前整个屏幕
confirmCommand = new Command( "Confirm", Command.SCREEN, 2 );
errorCommand = new Command( "Error", Command.SCREEN, 2 );
infoCommand = new Command( "Information", Command.SCREEN, 2 );
warningCommand = new Command( "Warning", Command.SCREEN, 2 );
textbox = new TextBox( "Main UI",
"Please click the soft keys to choose a Alert to run....", 256, 0 );
textbox.addCommand( alarmCommand );
textbox.addCommand( confirmCommand );
textbox.addCommand( errorCommand );
textbox.addCommand( infoCommand );
textbox.addCommand( warningCommand );
textbox.addCommand( exitCommand );
textbox.setCommandListener( this );
alarmAlert = new Alert( "Alarm", "This is an \"ALARM\" alert! ", null,
AlertType.ALARM );
confirmAlert = new Alert( "Confirmation",
"This is an \"CONFIRMATION\" alert! ", null, AlertType.CONFIRMATION );
errorAlert = new Alert( "Error", "This is an \"ERROR\" alert! ", null,
AlertType.ERROR );
infoAlert = new Alert( "Info", "This is an \"INFORMATION\" alert! ", null,
AlertType.INFO );
warningAlert = new Alert( "Warning", "This is an \"WARNING\" alert! ", null,
AlertType.WARNING );
alarmAlert.setTimeout( 3000 );
confirmAlert.setTimeout( 3000 );
errorAlert.setTimeout( 3000 );
infoAlert.setTimeout( 3000 );
warningAlert.setTimeout( 3000 );
display.setCurrent( textbox );
}
protected void startApp() throws MIDletStateChangeException
{
}
protected void destroyApp( boolean arg0 ) throws MIDletStateChangeException
{
}
protected void pauseApp()
{
}
public void commandAction( Command cmd, Displayable arg1 )
{
if ( cmd == exitCommand )
{
try
{
destroyApp( true );
} catch ( MIDletStateChangeException e )
{
e.printStackTrace( );
}
notifyDestroyed( );
} else if ( cmd == infoCommand )
{
display.setCurrent( infoAlert );
} else if ( cmd == errorCommand )
{
display.setCurrent( errorAlert );
} else if ( cmd == alarmCommand )
{
display.setCurrent( alarmAlert );
} else if ( cmd == confirmCommand )
{
display.setCurrent( confirmAlert );
} else if ( cmd == warningCommand )
{
display.setCurrent( warningAlert );
}
}
}
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可以先在电脑上模拟测试下，程序的正确性。
2、打包
在工程名“FirstJ2ME”上右击->J2ME->Create Package
此时会在工程目录下的“deployed”文件夹下生成两个文件：FirstJ2ME.jad,FirstJ2ME.jar
这两个文件就是我们下面下载到手机上要用的文件。
在下载前要对FirstJ2ME.jad文件修改下，Eclipse打包后的FirstJ2ME.jad文件内容如下：
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MIDlet-Jar-Size: 2152
MIDlet-Jar-URL: FirstJ2ME.jar
MIDlet-Name: FirstJ2ME Midlet Suite
MIDlet-Vendor: Midlet Suite Vendor
MIDlet-Version: 1.0.0
MicroEdition-Configuration: CLDC-1.1
MicroEdition-Profile: MIDP-2.0
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在第一行插入如下一行内容：
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MIDlet-1: FirstJ2ME, , zieckey.j2me.study.AlertsMIDlet
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最后FirstJ2ME.jad文件内容如下：
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MIDlet-1: FirstJ2ME, , zieckey.j2me.study.AlertsMIDlet
MIDlet-Jar-Size: 2152
MIDlet-Jar-URL: FirstJ2ME.jar
MIDlet-Name: FirstJ2ME Midlet Suite
MIDlet-Vendor: Midlet Suite Vendor
MIDlet-Version: 1.0.0
MicroEdition-Configuration: CLDC-1.1
MicroEdition-Profile: MIDP-2.0
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插入的那一行内容解释如下：
MIDlet-1: 程序在手机上显示的名字, 手机上显示的程序图标, 类名(注意包括包名)
3、下载
下载可以有很多种方式，最简单的就是通过数据线把手机和电脑连接起来。另外还有红外、蓝牙、OTA等方式。把上述两个文件FirstJ2ME.jad,FirstJ2ME.jar下载到手机上。
4、安装和运行
在手机上安装刚下载的程序，注意安装时选择 jad 文件也就是FirstJ2ME.jad文件安装，然后运行。
看看效果如何？
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